Determination of the minimum thickness of crown pillar for safe exploitation of a subsea gold mine based on numerical modelling

2013 ◽  
Vol 57 ◽  
pp. 42-56 ◽  
Author(s):  
Xibing Li ◽  
Diyuan Li ◽  
Zhixiang Liu ◽  
Guoyan Zhao ◽  
Weihua Wang
Keyword(s):  
Numerical Modelling ◽  
Gold Mine ◽  
Minimum Thickness ◽  
Crown Pillar

Numerical modelling of a microreactor for thermocatalytic decomposition of toxic compounds

2011 ◽  
Vol 32 (3) ◽  
pp. 215-227 ◽  
Author(s):  
Paweł Jóźwik ◽  
Michał Karcz ◽  
Janusz Badur
Keyword(s):  
Numerical Modelling ◽  
Knudsen Diffusion ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Three Dimensional Model ◽  
Toxic Compounds ◽  
Slip Boundary ◽  
Standard Models ◽  
Thermocatalytic Decomposition

Numerical modelling of a microreactor for thermocatalytic decomposition of toxic compounds In this paper a three-dimensional model for determination of a microreactor's length is presented and discussed. The reaction of thermocatalytic decomposition has been implemented on the base of experimental data. Simplified Reynolds-Maxwell formula for the slip velocity boundary condition has been analysed and validated. The influence of the Knudsen diffusion on the microreactor's performance has also been verified. It was revealed that with a given operating conditions and a given geometry of the microreactor, there is no need for application of slip boundary conditions and the Knudsen diffusion in further analysis. It has also been shown that the microreactor's length could be practically estimated using standard models.

scholarly journals Determination Of Mercury (Hg) On Water Sample In Batang Kuantan River

2018 ◽  
Author(s):  
Purwo Subekti ◽  
Rindi Genesa Hatika ◽  
Indang Dewata ◽  
Alizar ◽  
Saiful Anwar
Keyword(s):  
Water Sample ◽  
Atomic Absorption ◽  
Water Samples ◽  
Gold Mining ◽  
Limit Of Detection ◽  
Atomic Absorption Spectrophotometer ◽  
Gold Mine ◽  
Flow Problems ◽  
Geochemical Studies

Batang Kuantan River is a river that still has a wild gold mine along the flow. Problems arising from the gold mine is the content of the metal it produces, one of which is mercury. Mercury is used in gold mining This research was conducted to see the mercury contained in the water in the flow of Batang Kuantan river. Geochemical studies have been performed by determining the pH and concentration of metal mercury (Hg) determination in water samples using Atomic Absorption Spectrophotometer (AAS). The results showed that The concentration of Hg on samples A1 and A3 is 0.009 mg / L and 0.0078 mg / L. The A2 and A3 samples found a low reading of the limit of detection. The concentration values of Hg samples A1 and A4 are above the standards specified by PP No.82 tahun 2001 i.e 0.002 mg/L.

Application of numerical modelling for assessing electric and thermal operation modes of direct current catenary elements

2020 ◽  
pp. 90-93
Author(s):  
Andrey Borisovich Batrashov ◽  
◽  
Natalya Vladimirovna Gushhina ◽  
Keyword(s):  
Numerical Modelling ◽  
Direct Current ◽  
Thermal Characteristics ◽  
Thermal Loads ◽  
Main Principle ◽  
Thermal Operation ◽  
Operation Conditions ◽  
Operation Modes ◽  
Digital Copy

The paper proposes a method for assessing electric and thermal operation modes of direct current catenary elements that allows determining electric and thermal loads in operation conditions. The main principle is the determination of the most loaded section in the intersubstational zone and calculation of electric and thermal characteristics in conditions of real train schedule. The method is assumed to be used at digitalization of railways as a digital copy of direct current catenary.

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